Staff View: Leaching Behaviour of Synthetic Leachate through a Sewage Sludge and Red Gypsum Composite as Intermediate Landfill Cover

Leaching Behaviour of Synthetic Leachate through a Sewage Sludge and Red Gypsum Composite as Intermediate Landfill Cover

This paper examines the environmental impact of the use of compacted sewage sludge: red gypsum (SS:RG) mixture as intermediate landfill cover in terms of yield and quality of leachate as characterised by hydraulic conductivity and leaching behaviour. A series of column tests using the constant head...

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Main Authors:	Nor Azalina, Rosli, Hamidi, Abdul Aziz, Ahmad Kueh, Beng Hong, Lim, Leonard Lik Pueh, Mohd Hafiz, Zawawi
Format:	Article
Language:	English
Published:	MDPI 2023
Subjects:	TA Engineering (General). Civil engineering (General) TD Environmental technology. Sanitary engineering
Online Access:	http://ir.unimas.my/id/eprint/41385/1/Leaching%20Behaviour%20of%20Synthetic%20Leachate.pdf http://ir.unimas.my/id/eprint/41385/ https://www.mdpi.com/journal/sustainability https://doi.org/10.3390/su15054229
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id	my.unimas.ir.41385
record_format	eprints
spelling	my.unimas.ir.413852023-02-27T02:32:13Z http://ir.unimas.my/id/eprint/41385/ Leaching Behaviour of Synthetic Leachate through a Sewage Sludge and Red Gypsum Composite as Intermediate Landfill Cover Nor Azalina, Rosli Hamidi, Abdul Aziz Ahmad Kueh, Beng Hong Lim, Leonard Lik Pueh Mohd Hafiz, Zawawi TA Engineering (General). Civil engineering (General) TD Environmental technology. Sanitary engineering This paper examines the environmental impact of the use of compacted sewage sludge: red gypsum (SS:RG) mixture as intermediate landfill cover in terms of yield and quality of leachate as characterised by hydraulic conductivity and leaching behaviour. A series of column tests using the constant head method is carried out by percolating the synthetic leachate through samples that have been compacted at various degrees (60, 70, 75, 80 and 85%). The leachate quality is monitored at pre-determined days for pH, COD, Cu, Fe and Zn. In general, hydraulic conductivity decreases in three stages, in which the first stage is mainly attributed to the particle rearrangement and hydration of calcium silicate hydrate (CSH). The hydration of CSH increases the pH, which causes the heavy metal to precipitate and be entrapped within the matrices of CSH gel, thereby further reducing the porosity and hydraulic conductivity. A minimum of 75% compaction has shown favourable final porosity, hydraulic conductivity, and leachate quality, although a minimum of 80% compaction is recommended in order to achieve a satisfactory compressive strength of greater than 345 kPa for a landfill operation. MDPI 2023-02-26 Article PeerReviewed text en http://ir.unimas.my/id/eprint/41385/1/Leaching%20Behaviour%20of%20Synthetic%20Leachate.pdf Nor Azalina, Rosli and Hamidi, Abdul Aziz and Ahmad Kueh, Beng Hong and Lim, Leonard Lik Pueh and Mohd Hafiz, Zawawi (2023) Leaching Behaviour of Synthetic Leachate through a Sewage Sludge and Red Gypsum Composite as Intermediate Landfill Cover. Sustainability, 15 (4229). pp. 1-15. https://www.mdpi.com/journal/sustainability https://doi.org/10.3390/su15054229
institution	Universiti Malaysia Sarawak
building	Centre for Academic Information Services (CAIS)
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Malaysia Sarawak
content_source	UNIMAS Institutional Repository
url_provider	http://ir.unimas.my/
language	English
topic	TA Engineering (General). Civil engineering (General) TD Environmental technology. Sanitary engineering
spellingShingle	TA Engineering (General). Civil engineering (General) TD Environmental technology. Sanitary engineering Nor Azalina, Rosli Hamidi, Abdul Aziz Ahmad Kueh, Beng Hong Lim, Leonard Lik Pueh Mohd Hafiz, Zawawi Leaching Behaviour of Synthetic Leachate through a Sewage Sludge and Red Gypsum Composite as Intermediate Landfill Cover
description	This paper examines the environmental impact of the use of compacted sewage sludge: red gypsum (SS:RG) mixture as intermediate landfill cover in terms of yield and quality of leachate as characterised by hydraulic conductivity and leaching behaviour. A series of column tests using the constant head method is carried out by percolating the synthetic leachate through samples that have been compacted at various degrees (60, 70, 75, 80 and 85%). The leachate quality is monitored at pre-determined days for pH, COD, Cu, Fe and Zn. In general, hydraulic conductivity decreases in three stages, in which the first stage is mainly attributed to the particle rearrangement and hydration of calcium silicate hydrate (CSH). The hydration of CSH increases the pH, which causes the heavy metal to precipitate and be entrapped within the matrices of CSH gel, thereby further reducing the porosity and hydraulic conductivity. A minimum of 75% compaction has shown favourable final porosity, hydraulic conductivity, and leachate quality, although a minimum of 80% compaction is recommended in order to achieve a satisfactory compressive strength of greater than 345 kPa for a landfill operation.
format	Article
author	Nor Azalina, Rosli Hamidi, Abdul Aziz Ahmad Kueh, Beng Hong Lim, Leonard Lik Pueh Mohd Hafiz, Zawawi
author_facet	Nor Azalina, Rosli Hamidi, Abdul Aziz Ahmad Kueh, Beng Hong Lim, Leonard Lik Pueh Mohd Hafiz, Zawawi
author_sort	Nor Azalina, Rosli
title	Leaching Behaviour of Synthetic Leachate through a Sewage Sludge and Red Gypsum Composite as Intermediate Landfill Cover
title_short	Leaching Behaviour of Synthetic Leachate through a Sewage Sludge and Red Gypsum Composite as Intermediate Landfill Cover
title_full	Leaching Behaviour of Synthetic Leachate through a Sewage Sludge and Red Gypsum Composite as Intermediate Landfill Cover
title_fullStr	Leaching Behaviour of Synthetic Leachate through a Sewage Sludge and Red Gypsum Composite as Intermediate Landfill Cover
title_full_unstemmed	Leaching Behaviour of Synthetic Leachate through a Sewage Sludge and Red Gypsum Composite as Intermediate Landfill Cover
title_sort	leaching behaviour of synthetic leachate through a sewage sludge and red gypsum composite as intermediate landfill cover
publisher	MDPI
publishDate	2023
url	http://ir.unimas.my/id/eprint/41385/1/Leaching%20Behaviour%20of%20Synthetic%20Leachate.pdf http://ir.unimas.my/id/eprint/41385/ https://www.mdpi.com/journal/sustainability https://doi.org/10.3390/su15054229
_version_	1758954034324045824
score	13.211869

Leaching Behaviour of Synthetic Leachate through a Sewage Sludge and Red Gypsum Composite as Intermediate Landfill Cover

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